Question

Calcule o zero de cada função A) f(x)= 5x+15 B) f(x)= 2x-1/2 C) f(x)= 15x+3x-5 D) f(x)= 2x-3/4

Answer 1

A) f(x)= 5x+15
5x+15=0
x=-15/5
x=-3

 B) f(x)= 2x-1/2
2x-1/2=0
2x=1/2
4x=1
x=1/4
C) f(x)= 15x+3x-5
12x-5=0
12x=5
x=5/12

D) f(x)= 2x-3/4
2x-3/4=0
2x=3/4
8x=3
x=3/8

Answer 2

A) 5x+15 = 0
5x = -15
x = -3
B) 2x-1/2 = 0
2x = 1/2
x = 1/2 . 1/2
x = 1/4
C) 15x+3x-5 = 0
18x = 5
x = 5/18
D)  2x-3/4 = 0
2x = 3/4
x = 3/4 . 1/2
x = 3/8